oh gosh...i dont remember the name of the monster, but its this red lizard thingy , with like 33,333 hp , or something (way too much for a normal monster)
there should be a good faq/walkthrough on either
www.gamefaqs.com or
www.gamewinners.com. you should try those. but im sure someone here can tell you
(lots and lots of ff7 fans)